Free Online Mechanical Strength of Materials Practice Test - Set 20 - ObjectiveBooks
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# Practice Test: Question Set - 20

1. When the shear force diagram is a parabolic curve between two points, it indicates that there is a
(A) Point load at the two points
(C) Uniformly distributed load between the two points
(D) Uniformly varying load between the two points

2. In order to avoid sliding of masonry dam, the force of friction between the dam and soil should be at least __________ the total water pressure per meter length.
(A) Equal to
(B) 1.5 times
(C) Double
(D) 2.5 times

3. The design of thin cylindrical shells is based on
(A) Hoop stress
(B) Longitudinal stress
(C) Arithmetic mean of the hoop and the longitudinal stress
(D) Geometric mean of the hoop and longitudinal stress

4. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The minimum normal stress will be
(A) 400 MPa
(B) 500 MPa
(C) 900 MPa
(D) 1400 MPa

5. In the below figure, the point C represents
(A) Elastic limit
(B) Upper yield point
(C) Lower yield point
(D) Breaking point

6. If the section modulus of a beam is increased, the bending stress in the beam will
(A) Not change
(B) Increase
(C) Decrease
(D) None of these

7. In the below figure, the point E represents.

(A) The maximum stress
(B) The minimum stress
(C) No stress
(D) None of these

8. The maximum deflection of a cantilever beam of length ‘l’ with a point load ‘W’ at the free end is
(A) Wl3/3EI
(B) Wl3/8EI
(C) Wl3/16EI
(D) Wl3/48EI

9. The strength of a riveted joint is equal to the
(A) Pull required to tear off the plate per pitch length (Pt)
(B) Pull required to shear off the rivet per pitch length (Ps)
(C) Pull required to crush the rivet per pitch length (Pc)
(D) Minimum value of Pt, Ps or Pc

10. The torsional rigidity of a shaft is given by
(A) T/J
(B) T/θ
(C) T/r
(D) T/G

11. A localized compressive stress at the area of contact between two members is known as
(A) Tensile stress
(B) Bending stress
(C) Crushing stress
(D) Shear stress

12. The product of Young's modulus (E) and moment of inertia (I) is known as
(A) Modulus of rigidity
(B) Bulk modulus
(C) Flexural rigidity
(D) Torsional rigidity

13. A body is subjected to a direct tensile stress (σ) in one plane. The shear stress is maximum at a section inclined at __________ to the normal of the section.
(A) 45° and 90°
(B) 45° and 135°
(C) 60° and 150°
(D) 30° and 135°

14. Two solid shafts 'A' and 'B' are made of the same material. The shaft 'A' is of 50 mm diameter and shaft 'B' is of 100 mm diameter. The strength of shaft 'B' is _________ as that of shaft A.
(A) One-half
(B) Double
(C) Four times
(D) Eight times

15. For a given stress, the ratio of moment of resistance of a beam of square cross-section when placed with its two sides horizontal to the moment of resistance with its diagonal horizontal, is
(A) 1/2
(B) 1
(C) 1/√2
(D) √2

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